Search travel partners from San Diego to the grand parks first week of October

Hi !
I'm a french graduate student spending two month in San Diego for a collaboration work. It's my first time in America, and I will have time for a trip only the first week of october, before leaving back to France.

I plan to rent a car from San Diego, and to visit some of the grand parks, at least the grand Canyon. I'm searching for travel partners who could join me for that period, and share the costs and the enjoyments of the trip... Is there anybody interested ?